build(ci): add publish to Docker Hub

.github/workflows/publish.yml

@@ -0,0 +1,46 @@
+name: Publish
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 'lts/*'
+          cache: 'npm'
+          cache-dependency-path: '**/package-lock.json'
+          registry-url: https://registry.npmjs.org/
+      - run: npm ci
+      - run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+  publish-docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 'lts/*'
+          cache: 'npm'
+          cache-dependency-path: '**/package-lock.json'
+          registry-url: https://registry.npmjs.org/
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USER }}
+          password: ${{ secrets.DOCKER_PASS }}
+      - run: echo TAGNAME=`echo ${{ github.ref_name }} | sed 's/v//'` >> ${GITHUB_ENV}
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: |
+            opengovsg/mockpass:latest
+            opengovsg/mockpass:${{ env.TAGNAME }}